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Which of the following is correct regarding anaerobic digestion in the sludge digestion process?

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Which of the following is correct regarding anaerobic digestion in the sludge digestion process?

(a) It contains high amount of biomass

(b) It is a low energy process

(c) It causes infertility in soil

(d) Aerobic bacteria oxidize the organic matter

I had been asked this question in homework.

Question is from Digestion of Sludge, Sludge Digestion Tank topic in section Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Right answer is (b) It is a low energy process

Best explanation: Anaerobic digestion is a low energy process that contains low amount of biomass and where both facultative and anaerobic bacteria solubilize the organic matter.

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